Ages of CSOs: the case of 4C 31.04

Details Ages of CSOs: the case of 4C 31.04 Ages of CSOs: the case of 4C 31.04

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003newar..47..613g&link_type=abstract

New Astronomy Reviews, Volume 47, Issue 6-7, p. 613-616.

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We observed the CSO 4C31.04 with VLBI at 5 GHz in 1995 and 2000. An expansion of the source is apparent between the two epochs. Results of the modelfit indicate an average hot spot velocity of (0.43+/-0.08) h50-1c, yielding an estimated age of ~550 years (assuming uniform velocity). A study of the spectral index distribution between 1.6 and 5 GHz suggest a larger age (3000-5000 yrs), however still in agreement with the youngness of the source.

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